Process of welding metals



A. F. JENKINS.

PROCESS OF WELDING METALS. APPLICATION FILED MAR-5, 1921. RENEWED rEs.18,1922.

UNITE STATES ALEXANDER I. JENKINS, OI- BAL'IIMORE, MARYLAND.

PROCESS OF WELDING METALS.

' Specification of Letters Patent. Patented Apr. 11,1922.

Original application filed Kay 8, 1918,- Serial No. 283,306. Divided andthis application filed March 5, 1921, Serial No. 449,784. Renewediebruary 18, 1922. Serial No. 587,847.

To all whom it may concern: Be it known that I, ALEXANDER F. JEN- KINS,a citizen of the United- States, and residing'a't Baltimore city, Stateof Maryland, have invented certain new and useful Improvements inProcesses of Welding Metals, of which the following is a specification.

Thisinvention relates to methods of welding metals and particularly tomethods of coating wherein small metallic particles are fed to a jointto be welded or on to a surface on which a metal coating is to beformed, the particles and the work being heated, so that they weldthemselves together and to the work.- Y

The object of the invention is to provide a novel method of applying theheating flame and the metal partlcles to the work whereby the weld ismade quickly and efficiently and without losing or scattering the metalparticles which are being supplied in the weldin operation.

The met od consists in preferably preheating the metal to be welded orfilled, using the torch flame, and when the metal is suflicientl heated,the granulated metal is forcibly fled to the work by a stream of ox genor other fluid, or by any other suitab e agency, with the result thatthe particles immediately adhere to the heated surface, and under theinfluence of additional heat from the torch flame there is a quickamalgamation of the articles with the metal being welded or fillePractice shows that metal added in this manner amalgamates morethoroughly than when. the solid rod is used, and furthermore that themetal does not have to be puddled in the way necessa with a solid rod tocause amalgamation. ll is referable, at the time of feeding the metalparticles, to cut down the gas flow to the flame to a .point suflicientto keep the flame from extinguishing, as otherwise the high pressure'ofthe flame would blow the particles away fromthe work. As soon as theparticles adhere, the flame is restored and played on the work'andmetal'particles to complete the amalgamation. i

= For a more complete understanding of the invention reference is to behad to the following description and claims taken in connection with theaccompanying drawings which illustrates one embodiment of which theinvention is capable. The torch apparatus illustrated is claimed in mycopending filed May 8,

application, Serial No. 233,306, 1918, of which this isfa division.

' The fi gas and oxygen mix in the tube 4 to which the nozzle isattached. The torch has a handle 5 through which the gas and oxygenconduits extend, and at the rear end of the gure is aside view of atorch equipped with the automatic metal particle handle are mixtureregulating valves 6 and- 7 in the tubes 2 and 3. At the front end of thehandle the tubes have trigger valves 8 and 9, each normally held open bya spring 10. The trigger 11 of valve 8 has a cam 12 whlch engagesthetrigger 13 of valve 9 so as to close the latter as the operator closesthe valve 8, for the purpose of regulating the flame.

Associated with the top 1 is a metal particle spraying nozzle'14 whichis connected with a reservoiror equivalent means 15 that holds metalparticles, and into the nozzle leads a pipe 16 which terminates in anejector nozzle 17. The pipe is connectedv with the oxygen conduit at apoint on the inlet side of the regulating valve 7, sothat the fullpressure of the oxygen will be available for the spraying device. thepipe 16 is a controlling va1ve'18 pro- Vide with a trigger 19 that isunder the tension of the valve-closing spring 20 and that is adapted tobe engaged by'the cam 21 on the trigger 13, so that when the valves 8and9 are closed the spraying valve 18 will be open;

always f n If desired, in certain instances the spray- Y ing of metalcan take place when the welding flame is o crating, this being done byholding the va ve 18 open ;while the valves 8 and 9 are open. But it. ispreferable to spray the metal particles while the flame is not operatingat full force (as shown in the drawing), as otherwise the particlesmight be blown away. The flame is cut down by operating the trigger 11just low enough to prevent extinguishing, and this takes placesimultaneously with the opening of the metal feed. In the figure thevalves 8 and 19 are closed and the valve 18 opened.

In use, the flame is used to preheat the work, and when the latter issufficiently heated, the flame is manually reduced and the metalparticle feed simultaneously opened. The particles will now adhere tothework, and when a suflicient amount of particles are sprayed the feed isstopped and the flame restored to complete the weld by additional heat.The universal joint 22 permits of adjustment of the metal dischargingnozzle whenever required. a From the foregoing description theadvantages of the method will be readily understood by those skilled inthe art to which the invention appertains, and while I have describedthe principle of operation, together with the device which I nowconsider to be the best embodiment thereof, I desire to have itunderstood that the method may be carried out by apparatus having widelydifi'erent construction, not being limited to one particular apparatus.

Having thus described the invention what I claim as new and desire tosecure by Letters Patent is:

1. The hereindescribed method of welding or uniting metals, whichconsists in heating the work to a suitable degree, feeding metalparticles to the work while the heating flame ALEXANDER F. JENKINS.

